<template>
  <div class="login_container">
    <div class="login_box">
 <!-- 头像区 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="avatar" />
      </div>
      <!-- 登录表单 -->
      <div>
        <el-form
          ref="loginFormRef"
          :model="loginForm"
          :rules="loginFormRules"
          label-width="60px"
          class="login_form"
        >
          <el-form-item label="账号" prop="username">
            <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
          </el-form-item>
          <el-form-item label="密码" prop="password">
            <el-input
              v-model="loginForm.password"
              type="password"
              prefix-icon="iconfont icon-3702mima"
            ></el-input>
          </el-form-item>
          <el-form-item class="btns">
            <el-button type="primary" @click="login">登录</el-button>
            <el-button type="info" @click="resetLoginForm">重置</el-button>
          </el-form-item>
        </el-form>
      </div>
    </div>
  </div>
</template>

<script>
  export default{
    data () {
        return {
          loginForm: {
            username: 'admin',
            password: '123456'
          },
          // 表单验证
          loginFormRules: {
            username: [
              { required: true, message: '请输入用户名', trigger: 'blur' },
              { min: 2, max: 10, message: '长度在 2 到 10 个字符', trigger: 'blur' }
            ],
            password: [
              { required: true, message: '请输入用户密码', trigger: 'blur' },
              { min: 6, max: 18, message: '长度在 6 到 18 个字符', trigger: 'blur' }
            ]
          }
        }
      },
      methods:{
        // 表单重置按钮
            resetLoginForm () {
              // resetFields：element-ui提供的表单方法
              this.$refs.loginFormRef.resetFields();
            },
            login () {
                  // 表单预验证
                  // valid：bool类型
                  this.$refs.loginFormRef.validate(async valid => {
                    if (!valid) return false
                    // this.$http.post('login', this.loginForm): 返回值为promise
                    // 返回值为promise，可加await简化操作 相应的也要加async
                    const { data: res } = await this.$http.post('login', this.loginForm)
                    // console.log(res)
                    if (res.meta.status !== 200) return this.$message.error('登录失败')
                    this.$message.success('登录成功')
                    // 1、将登陆成功之后的token, 保存到客户端的sessionStorage中; localStorage中是持久化的保存
                    //   1.1 项目中出现了登录之外的其他API接口，必须在登陆之后才能访问
                    //   1.2 token 只应在当前网站打开期间生效，所以将token保存在sessionStorage中
                    window.sessionStorage.setItem('token', res.data.token)
                    // 2、通过编程式导航跳转到后台主页, 路由地址为：/home
                    this.$router.push('/home')
                  })
                }
      }
  }
</script>

<style lang="less" scoped="scoped">
  .login_container {
    background-color: #2b4b6b;
    height: 100%;
  }
  .login_box {
    width: 450px;
    height: 360px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    -webkit-transform: translate(-50%, -50%);
    background-color: #fff;

    .avatar_box {
      width: 130px;
      height: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #fff;
      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
  }
  .login_form {
    position: absolute;
    bottom: 60px;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }
  .btns {
    display: flex;
    justify-content: center;
  }
  .info {
    font-size: 13px;
    margin: 10px 15px;
  }
</style>
